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(4*(7-x))/2 = -2 // + 2
(4*(7-x))/2+2 = 0
(4*(7-x))/2+(2^2)/2 = 0
4*(7-x)+4 = 0
32-4*x = 0
(32-4*x)/2 = 0
(32-4*x)/2 = 0 // * 2
32-4*x = 0
32-4*x = 0 // - 32
-4*x = -32 // : -4
x = -32/(-4)
x = 8
x = 8
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